MIL-DTL-3432J
APPENDIX B
B.2.4 Insulating compound, type IL, low temperature, natural rubber deposited from a rubber latex compound.
Unaged:
Tensile strength, minimum psi
3000
Elongation, minimum %
650
Set, maximum, inch
.063
After 95 ± 1 hour oxygen bomb aging at 70°C:
Tensile strength, minimum % of original
70
Elongation, minimum % of original
70
Ozone resistance (after air oven conditioning and
168 ± 1 hour in ozone) at 100°F
no visible cracks
Brittleness temperature, unaged, max. °C
-55
After aging, max. °C
-55
B.2.5 Insulating compound, type IH, low temperature, heat and ozone resistant ethylene-propylene rubber (EPM) or
ethylene-propylene-diene rubber (EPDM).
Unaged:
Tensile strength, minimum psi
800
Elongation, minimum %
250
Set, maximum, inch
.375
Tensile stress at 200% elongation, minimum psi
200
After 168 ± 1 hour oxygen bomb aging at 80°C:
Tensile strength, minimum % of original
90
Elongation, minimum % of original
75
After 20 ± 1/2 hour air pressure aging at 127°C:
Tensile strength, minimum % of original
90
Elongation, minimum % of original
75
Oven aging at 121°C:
Tensile strength, minimum % of original
85
Elongation, minimum % of original
75
Ozone resistance (after air oven conditioning and
168 ± 1 hour in ozone) at 120°F
no visible cracks
Brittleness temperature, unaged, max.°C
-55
After aging, max °C
-55
Torsional stiffness ratio, maximum, at -55°C.
5
Torsional modulus, maximum psi, at -55°C.
900
Cold tension recovery, minimum %, at -55°C.
10
33
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